At the investiture of a new Pope there's always a ceremony involving the Chief Rabbi at the time. During the ceremony, the Pope hands the Rabbi an ancient piece of parchment. The Rabbi opens it, reads it and hands it back to the Pope, shaking his head. A newly ordained cardinal got curious about this and asked one of the Pope's advisors what was on the parchment.

'Ah my son, it is the bill for the Last Supper, no one will pay it!'

LTS